Display panel or portion thereof with a computer-generated graphical user interface



The single FIGURE is a front view of a display panel or portion thereof with a computer-generated graphical user interface showing our new design.

The dashed lines showing portions of the graphical user interface form no part of the claimed design. The dot-dash lines in the single figure represents a display panel or portion thereof and forms no part of the claimed design. 

CLAIM The ornamental design for a display panel or portion thereof with a computer-generated graphical user interface, as shown and described. 